Gas-light negative-printing attachment.



c ol-yemzve A HORNE YS 15 INVENTOR G. W. HARSE'. GAS LIGHT NEGATIVEPRINTING ATTACHMENT.

APPLIOATI'ON FILED 0012, 1903. y

W! TNE SSE S NO MODEL.

I A UNITED SFATES Patented April 26, 1904.

PATENT ()FFIQE.

GAS-LIGHT NEGATIVE-PRINTING ATTACHMENT.

SPECIFICATION formingpart of Letters Patent N... 758,444, dated n rilee, 1904.

Application filer. October 2, 1903.

3 T all whom it 772/007 concern.-

v Be it known thatLGnoRen WILLIAM HARsn, a citizen of the United States,and a resident of the city of New York, borough of Brooklyn, in thecounty of Kings and State of New York,

' have invented a new and Improved Gas-Light candescent mantles.

One object that I have in view is the pro vision of a simple, light, andcheap device which may be easilyfitted to an ordinary gasburner inaposition to expose a negative and tance from the light and to providean im-- the sensitized paper held in an ordinary printi ing-frame to therays of light.

' A further object is to provide means for holding the printing-frame atany desired disproved form of holder adapted to receive printing-framesof different sizes and allow the'rapid introduction or removal thereof.

Further objects and advantages of the invention will appear in thecourse of the subjoined description, and the actual scope thereof willbe defined by the annexed claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view illustrating my device applied to anordinary gas-burner and supporting a printing-frame of the usualconstruction. Fig. 2 is a vertical sectional elevation through the partsshown by Fig. 1, omitting the gas-burner, the plane of the section beingindicated by the dotted line 2 2 of Fig. 4:. Fig. 3 is a cross-sectionon the line 3 3 of Fig. 4 looking in the direction of the arrow; andFig. I is a detail plan view of the holder and its associated partsapplied to a portion of the supporting-arm, the printingframe beingomitted.

In carrying my invention into practice I employ an arm 5, a holder 6,and means for 5 adjustably clamping said holder upon the arm,

Serial No. 175,480. (No model.)

the latter being constructed for application to an ordinary gas-burnerA, the several parts being disposed for cooperation in supportinga'printing-frame B in thedesired position relative to the gas-burner.

In a device intended to be mounted or supported on a gas-burner it isnecessary to reduce the weight of the entire device as much as possibleand at the same time to make the parts quite strong, so that they. areable to support the printing-frame'in a position to expose the negativeand the sensitized paper to the action of the light-rays.

The arm 5 is made of a single piece of sheet metal, which is pressed orstruck up in a suitablemachine, so'as' to provide longitudinal flangesor lips 7 atth'e side edges thereof, thereby giving the plate 5 achanneled form in cross-section, as indicated more clearly by Figs. 1and 3. Any suitable means may be provided near one end portion of thearm 5 for mounting it upon the gas-burner A; but,

as shown by Figs. 1 and 2, this arm is formed 'with an upstanding nipple8, which is adapted to receive the stationary part on the gaspipeA,"after which the burner A is screwed on said stationary part in a wayto engage with the nipple 8, and thus firmly connect the arm 5 to saidpipe and burner. The nipple affords an enlarged bearing for the arm onthe burner;' but I do not desire to strictly confine myself to thisdetail of construction. The arm 5 is also provided with a longitudinalslot 9, which may be of any desired length, the free end of said slotterminating a considerable distance away from the nipple, as shown bythe drawings.

The holder 6 is arranged transversely of the arm 5 in order to occupy aposition at right angles across said arm, substantially as shown by thedrawings. This holder consists of a flat bottom plate having anupstanding narrow flange 10 at its front edge and a higher flange 11 atits rear edge, the two flanges being arranged in parallel relation andforming a groove or channel which is adapted to receive theprinting-frame B. As shown, I prefer to make the holder 6 wider-than thethickness of the printing-frame, and in order to hold frames ofdiflerent thicknesses securely Within the holder a fricti0n-spring 12 ispro vided within said holder. As shown by Fig. 2, the spring is bowed orcurved, and one end of the spring is secured firmly to an end portion ofthe holder, as by riveting the spring at 13 to the front flange 10 Theother end of the spring is curved reversely at its bowed portion, and itis free or unconfined, thus allowing the spring to be pressed toward theflange 10 when a printing-frame is introduced into the holder. The meanswhich I prefer to employ for slidably or adjustably connecting theholder to the arm consists of a guide boxing 14:, preferably constructedof metal and secured to the under or bottom face of the holder in anyapproved way, as by riveting or soldering the parts. This guide-boxingis provided with depending flanges 15 and with inwardly-extendingflanges 16, said boxing being made or struck up in the form shown byFig. 3. The depending flanges 15 of the guide-boxing are adapted toslidably embrace the flanges 7 of the channeled arm, whereas theinwardly extending flanges 16 of said guide-boxing fit below saidflanges 7, thus making the guide-boxing snugly embrace the channeled armin a way to prevent any loose movement or play of the boxing on the arm,while at the same time the boxing is capable of a slidable endwisemovement on the channeled arm 5. The guide-boxing 14:.extends rearwardlyfrom the flange 11 of the holder 6, and on this extended portion of theboxing is rigidly secured a thickened plate 17, having a threadedopening, said plate constituting a nut, which is shown as being madefast with the boxing, although said nut may be made in one piece withsaid boxing, if desired. A clamping-screw 18 passes through the slot 9of the channeled arm and has threaded engagement with the fixed nut 17of the guide-boxing, said screw 18 having a milled head 19. A washer 2Olies between the head of the clamping-screw and the under face of theslotted part 9 of the channeled arm, and the screw is adapted to betightened in order to clamp the holder firmly on the bar or arm at anydesired point of adjustment.

To apply my'device to a gas-burner, it is only necessary to remove theburner A from the threaded part of the pipe A and slip the nipple 8 ofthe channeled arm over said part of the pipe, after which the burner isreplaced. The flanged boxing 1A is slipped endwise over the slotted partof the arm in a way to bring the flange 10 of the holder opposite to theburner A, and this boxing, with its contained holder 6, may be held atany desired point of adjustment on the arm and at a suitable distancefrom the burner. The printing-frame is adapted to receive the negativeand the sensitized paper in the ordinary way, and this frame can beeasily and quickly slipped end wise into the holder 6. The light fromthe burner A should be diminished during the operation of placing theprinting-frame in the holder; but after the parts shall have beenproperly assembled the light can be increased in intensity, so that therays of light will pass through the negative and make the desired latentimpression on the sensitized paper.

The printing-frame can be easily removed from the holder, and theseveral parts may be adjusted, assembled, or dismounted, as may bedesired.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent- 1. A gas-light printing attachment of the classdescribed, having an arm provided with means for supporting the same ona gas-fixture, a holder arranged transversely of the arm and fittedslidably thereon, and means for clamping the holder at a desired pointof adjustment on the arm.

2. A gas-light printing attachment consisting of an arm, a holderarranged transversely across the arm and fitted slidably thereto, afriction spring carried by the holder, and means for clamping the holderadjustably to said arm.

3. A gas-light printing attachment, consisting of an arm having meansfor application to a burner, a holder slidably mounted on the arm andconstructed to receive printingframes of different sizes, means carriedby the holder for clamping a printing-frame firmly thereto, and meansfor securing the holder at a desired point of adjustment on the arm.

4. A gas-light printing attachment, consisting of a channeled arm havingmeans for ap plication to a gas-burner, a guide-boxing e111- bracing thechanneled arm, a holder movable with said boxing, and means for clampingthe boxing and holder at a desired point of adjustment on the arm.

5. A gas-light printing attachment, consisting of a channeled bar havingmeans for at tachment to a burner and a longitudinal slot, aguide-boxing embracing the channeled bar and slidable thereon, saidboxing havinga nut, a holder attached to the boxing and movabletherewith on said arm, and a clamping-screw passing through said slottedarm and having threaded engagement with the nut of the guide-boxing.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

GEORGE ILLIAM HARSE.

\Vitnesses: I

' GEORGE J. MGFADDEN,

J. N. DUNN.

